Erosion processes on sloping land of Yimeng Mountainous Region
Wang Zhiwei, Ai Zhao, Zhang Guoqing, Chen Zhicheng, Zhang Yongtao
(1.Forestry College of Shandong Agricultural University, 271018, Tai’an, Shandong, China；
2.Institute of New Forestry Technology, Chinese Academy of Forestry, 100091, Beijing, China)
Abstract：Soil erosion processes on sloping land of Yimeng Mountainous Region through indoor simulation of rainfall with different combinations of rainfall intensity and slope gradient. The results showed that: 1) the runoff time on slope surface advanced with the increase of rainfall intensity and slope gradient, but rainfall intensity had larger impact on runoff time than slope gradient; 2) Runoff speed was positively correlated with rainfall intensity and slope gradient, but less affected by rainfall intensity. The surface runoff speed on cinnamon was faster than on brown soil; 3) The runoff volume was positively correlated with rainfall intensity, but negatively connected with slope gradient; 4) Both soil erosion rate and total amount of erosion increased with the enhancement of rainfall intensity and slope gradient, but with different fluctuation magnitudes; 5) Rill erosion would sharply increase soil erosion rate. For brown soil, slope gradient was the leading factor affecting erosion rate at small rainfall intensities, while rainfall intensity became the major factor at strong intensities. For cinnamon, the erosion rate was mainly controlled by rainfall intensity; 6) Under the same external conditions, the erosion rate and total amount of erosion of brown soil were larger than those of cinnamon, indicating that the erosion-resistant ability of brown soil was weaker than that of cinnamon.
2013, Vol. 11 
